Wheeled scraper



Feb. 1, 1938.

T. R. PAULSEN WHEELED SCRAPER 2 Sheets-Sheet l Filed Jan. 9, 1937 ATTORNEYS. l

Feb. 1, 1938. T, R PAULSEN l 2,106,759

WHEELED S CR AFER Filed Jan. 9, 1937 I 2 Sheets-Sheet 2 f4 gg 5.9 57 4Z 7g 44 .38 g tgl 36 75 45 I e l @i L 3f 2./ Z0 l y @maa eaew. j! INVENTOR. sym/272W ATTORNEYS.

Patented Feb. 1, 1938 UNITED STATES PATENT OFFICE 2,106,759 WHEELED scRAPER waukee, Wis., a corporation of Delaware Application January 9,

14 Claims.

My invention relates to new and useful improvements in wheeled scrapers, and more particularly to that type of such scrapers, in which the bowl lls at its front end and dumps at its rear end.

In devices of this sort, the bowl is pivoted, adjacent its rear lower corners, to the carrying frame. A single hydraulic cylinder, or a pair of cylinders, mounted on the frame, serves to rotate the bowl about its pivot, in either direction from its neutral (i. e., carrying) position.

Each end of the bowl is provided with a closure, the front closure being known as the apron, and the rear closure being known as the endgate. f

When the bowl tips downward into its digging position, the apron opens. When the bowl tips upward into its dumping position, the end gate opens.

But, although these functions have been at'- tained in the prior art with a fair degree of satisfaction, I have found it desirable to effect the following improvements. l

A new and similar linkage for the apron should o be devised, so as to secure a wider opening of the y apron while digging, and furthermore to cause the' apron to so move'when opening and closing that the dirt will not interfere with these motions, and to relieve the bowl of the strain of supporting the weight of the loaded apron, and to eliminatev rollers for opening the apron.

The cylinders should be so positioned as to avoid their being damaged by dirt and stones.

'I'he end gate should be sopositioned as to avoid jamming and wear due to interference by the dirt in the bowl, and should be controlled without the use of sheaves, which tend to jam or. become disengaged.

The side beams should be so constructed and positioned as not to be interfered with by the ground.

And means should be provided for causing dry sand to ll the bowl, instead of merely piling up in front of the digging edge.

The attainment of these desiderata is the principal object of my invention.

In addition to my principal objects, above stated, I have worked out a number of novel and useful details, which will be readily evident as the description progresses.

My invention consists in the novel parts and in the combination and arrangement thereof, which are defined in the appended c1aims,'and

r of which one embodiment is exempliiied in the ac- 1937, Serial No. 119,790

BEISSU companying drawings, which are hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to the same member or to similar members.

Figures 1, 2, and 3 are -side elevations of one form of my scraper, taken along the line 2--2 of Figure 4 inside the wheels, showing a part of the frame in section. In Figure 1 the scraper is in digging position; in Figure 2 it is in carrying posi- 10 tion; and in Figure 3 it is in dumping poston.

Figure 4 is a plan View of the scraper of Figures 1, 2, and 3, in carrying position.

Figure 5 is a vertical longitudinal section of that scraper, taken along the lines 5-5 of 15 Figure 4, except that Figure v5 is in digging position.

Figure 6 is a front elevation, partially in section, of my anti-toggle catch and associated parts, taken along the lines 6--6 of Figure 2. y 20 Referring now to Figure 4, we see that II, II are the side beams, and I2 is the cross beam, and I3 is the tongue, of the main frame of my scraper. The tongue I3, shown broken oil?, extends to the tractor (not shown) which pulls my scraper. Wheels I4, I4 support the frame.

Turning now more particularly to Figures 1, 2, and 3, we see that the bowl I5 is pivoted at I6 to the side beams II. The bowl has a digging edge I'I. i

Hydraulic cylinders I8 are mounted in an elevated position on the main frame, Well forward and out of the way of the digging elements. The cylinders rotate the bowl I5 about its pivot I6, by means of piston rods I9, rocker-arms 20 35' and connecting-rods 2l. The cylinders are fed from a source (not shown) on the tractor, by means of piping (not shown) ,and may be controlled, preferably from the drivers seat (not shown) in any convenient conventional manner 40 (not shown).

Considering the carrying position of Figure 2 as neutral, it will be seen that a retraction of piston-rod I9 will lower the bowl I5 to the digging positionA shown in Figure 1, and that a thrusting out of this piston-rod will raise the bowl to the dumping position shown in Figure 3.

The apron 22 is pivotally supported by the upper ends of bent rods 23, the lower ends of said rods being pivotally supported by theframe at I6, the same point of support as that vwhich supports the bowl. The elbow of each bent rod rests upon a rotatable stop 24, on the frame. This relieves the bowl of having to carry the weight of the apron and its contents. It will be noted that the four sides of this stop are at successively different distances from its center of rotation, thus affording four different degrees of. elevation for the bent rod 23.

The notch in the upper edge of the bowl I5 bears against the pivot support of the apron 22, thus relieving the digging edge I1 of some of the weight of the apron and its contents in the dumping position. y

Bars 25, pivoted at one end to the bowl and is directly connected to the frame by chain 28.

When (see Figure 3) the bowl is lifted to its dumping position, the chain tautens, thus opening the end gate to permit the contents of the bowl and apron to escape rearwardly.

It will be noted that the side arms of the end gate 26 are disposed outside of the sides of the 4bowl I5, thus preventing the dirt within the bowl from interfering with'the opening and closing of the gate, and from causing wear thereof.

It will be noted that the side beams Il, by lacking a downward camber at their rear ends, are kept well elevated,. so that they will not become mired if the wheels sink into soft ground.

Turning now more particularly to Figure 5, we see that 29 are continuous chains, passing over upper tumblers 30, and lower tumblers 3|.

The upper tumblers are pivotally carried by the bowl, and the lower tumblers are pivotally carried by a ladder 32, which in turn is pivotally supported by the bowl at the same axis as the upper tumblers. The chains 29 carries slats 33, or other means of kicking sand.

l 'Ihe shaft 34, to which the upper tumblers 30 are keyed, has keyed to it pinions 35, which engage gears Keyed to rotate with each gear 36 is a sprocket 31.

'I'he links 38, pivotally supported by sidebeams II, carrying friction wheels 39 at their upper ends. Keyed to rotate with each of these friction wheels is a sprocket 40. Chains 4I drivably connect sprockets 40 to sprockets 31.

Through rods 42, levers 43, rods 44, levers 45, rods 46, and control means (not shown) at the drivers seat, friction wheels 39 can be rocked' forward into contact with the rubber tires of -wheels I4. When in such contact, the clockwise motion of wheels I4, as the scraper moves forward, will rotate friction wheels 39 counter clockwise. This motion is transmitted through sprockets 40, chains 4I, sprockets 31, gears 36, pinions 35, and tumblers 30, to drive the chains 29 clockwise; and thus cause the slats 33 to kick the sand,piled up by the digging edge I1, into the bowl.

As the sand piles up in the. bowl, the front end of the ladder 32, being floating free, rises; so that the slats always restlightly on the top of the pile of sand. This free-floating is one ofthe important features of my invention.

This sand kicker of mine, although of particular use in the combination in which it is here shown and described, would also be useful if the bowl were the dipper of a power-shovel, or the 36, also carried by the bowl I5.

bucket of a dragline excavator, or any other similar digging instrumentality.

Turning now to Figure 6, we see my optional means to prevent the apron from ever opening so far during digging that it will stick open when the bowl is raised to carrying position, although this is a relatively rare occurrence, and one which the dumping phase of the 'cycle would automatically correct anyway. v

41 is a dog, pivoted on lugs 48, which project inwardly from the top of each side beam II. As the bowl I5 descends from the dumping position of Figure 3 to the carrying position of Figure 2, the projection 49 on each bent rod 23 slips into the notch in the corresponding dog 41. Further descent ofy theA bowl I5 causes a plate 50 on its side wall to' engage the leaf spring 5|, thus locking the bent rod securely in place during digging; dirt, as it curls into the bowl, from forcing the apron so far open as to toggle, i. e. to rotate link 25 so far counterclockwise thatthe weight of the apronwill tend to hold it open rather than to close it, when the bowlreturns to carrying position. The stops 24 might be omitted, and the dogs 41 serve to perform their function. When the bowl rises again from the digging position of Figure 2, the bent rods 23 are still held down by the dogs 41 engaging the projections 49. Accordingly the bars 25 positively force the apron to close. Then, when the bowl reaches the carrying position of Figure 2, the'side of the bowl I5 disengages from'the leaf spring 5I, and the compression spring 52 tilts the dog 41 to disengage the projection 49, thus permitting the attaining of the dumping position.

' Having now described and illustrated one form of my invention, I Wish it to be understood that' bowl being open at both front and rear, and

having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron, pivotaliy supported by the links; eccentric rotatable stops on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; means connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted on the bowl; means, directly connecting the end gate to the frame, to open bowl is tilted from its carr ng position to its dumping position; means carried by the frame for tilting the bowl; means to kick sand into the bowl; and automatic means to lock the apron against togglng open during digging.

2. In a scraper, the combination' of a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame,- for tilting movement in a vertical plane, said bowl being open at both front and rear, and having avdigging edge at its front end; links pivoted and thus preventing the impact of the 1 to the carrying position of Figure i the gate when the' pivotally supported by the links; Vstops on the frame, supporting the links,'whereby to support the apron when'the bowl is in its carrying position, and to restrain the apron from accompanying the bowl whenl the latter is tilted to its digging position; means connecting the apron to the bowl `in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted on the bowl; means, directly connecting the end gate to the frame, to open the gate when the bowl is tilted from its carrying position-to its dumping'position; and means carried by the frame for tilting the bowl.

3. In a scraper, the combination of: a frame;

ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron, pivotally supported by` the links,

and having such a, bottom conformation that itsbottom will move in its own line when the apron opens; stops on the frame, supporting the links, whereby to suppport the apron when the bowl is in its carrying position, and to restrain the apron from accompanying the. bowl when the latter is tilted to its digging position; a pivoted link, connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted on the bowl; means, directly connecting the end gate to the frame, to open the gate -when the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl.

4. In a scraper, the combination lof:v a frame; ground supports for said frame; a bowl pivoted at'its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl being open at both front .and rear, and

having a digging edge at its front end; links 5. In a scraper, the combination of a frame; I

ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame, in such manner that the apron accompanies the bowl when the latter is tilted` to its dumping position; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; an end gate pivoted on the bowl;

means to open the gate when the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl.

6.- In a scraper, the combination of a frame;A

ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge Iat its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; an end gate pivoted on the bowl; means to lopen the gate when the bowl is tilted from its carrying position to its dumping position; and means, including atleast one duid-power cylinder and cooperating linkage, carried by the frame for tilting the -bowl, the cylinder being mounted above andv well in advance of the digging edge of the bowl.

7. In a scraper, the combination of aframe; ground supports for said frame; a bowl pivoted on theframe for tilting movement in a vertical plane, said bowl being open at both front'and rear, and having a digging edge at its front end;

a front apron, pivotally supported by means which is independent of the bowl and whichvis in turn supported by the frame; means to restrain the apron from laccompanying the bowl when the latter is tilted toits diggingV position;

on" the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; an end gate pivoted on the bowl; means, directly connecting the gate tothe frame, to open the gate when the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl.

- 9. In a scraper, the combination of a frame; ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open at both frontand rear, and having a digging edge at its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; means to restrain the apron from accompanying the bowl .when the latter is tilted to its digging position,

said means including an excentric stop; an end gate pivoted on the bowl; means to open the gate when the bowl is tilted from its carrying position to itsv dumping position; means carried by the frame for tilting the bowl.

10. In a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end; links pivoted adjacent the-rear of the assembly; a front apron, pivotally supported by the links; means on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and to restrain the apron from accompanying the bowl when the latter is tilted to its digvging position; means connecting the apron'to thebowl in such a manner that the downward tilting of lthe bowl from its carrying to its digging position forcesl the apron to tilt upwardly; an end gate pivoted on the bowl; means connecting the end gate to the frame, to open the gate when the bowl is tilted from its carrying position to its dumping position; means carried by the frame for tilting the bowl; a catch, carried by the frame, f or engaging atleast one of the links when the vbowl is in digging position; and means to automatically lock the catch in this position, and to automatically release it for dumping.

11. In a scraper, the combination of a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, vsaid bowl being open at both front and rear,. and having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron, pivotally supported by the links; means on the frame, supporting the links, whereby to support theapron when the bowl is in its carrying position, and to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; means connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted 'on the bowl; means connecting the end gate to the frame, to open the gate when the bowl is tilted from its carrying position to its dumping position; means carried by the frame for tilting the bowl; a catch, carried by the frame, for engaging atleast one of the links when the bowl is in digging position; and means to automatically lock vthe catch in this position, and to automatically release it for dumping, said last named-means being aprojection on the catch engaged by the side ofthe bowl.

12. In a scraper, the combination of: a frame; ground supports -for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open` at both front and rear, and having a digging edge at its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; means to restrain the apron from accompanying the bowl when the latter is tilted to itsn digging position, and to positively close the apron as the bowl returns to its carrying position; an end gate pivoted on the bowl; means to open the gate when the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl.

13. In a scraper, the combination of. a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame for' tilting movement in a vertical plane, said bowl being open.Y `at both front and rear and having a digging edge at its front end; links pivoted adjacent, the. rear of the assembly; a front apron supported by the links; connections between the bowl and the apron; stops on the frame, supportingthe links, whereby to sup-z port the apron when the bowl is in its carrying position, and in coaction with the-above-mentioned connections to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; an end gate pivoted4 on. 25

the bowl; means to open the gate whenthe bowl is tilted from its carrying position to its,A dumping position; and means carried by the frame for tilting the bowl.

14. In' a scraper, the combination of: a frames ground supports for the frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end;

a front apron pivotally supported by means` which is independent of the bowl and which is in turn supported by the frame; linkage operatively connecting the apron to the bowl, whereby the apron is opened when the bowl is4 tilted to its digging position; means carried by the frame for tilting the bowl; an end. gate pivoted on the bowl; means to open the gate when the bowl is tilted from its carrying position to its dumping position; and automatic means to lock the apron against toggling open during digging.

I THOMAS R. PAULSEN. 

